Showing 81–90 of 439 questions
Q.81
Easy
Quantitative Aptitude
The average of 5 numbers is 24. If one number is replaced by 48, the new average becomes 30. Which number was replaced?
Explanation:
Sum of 5 numbers = 5 × 24 = 120. New sum = 5 × 30 = 150. Difference = 150 - 120 = 30. Replaced number = 48 - 30 = 18.
Q.82
Medium
Quantitative Aptitude
If the length of a rectangle is increased by 20% and breadth is decreased by 10%, what is the percentage change in area?
A
8% increase
B
10% increase
C
8% decrease
D
12% increase
Correct Answer:
A. 8% increase
Explanation:
Original area = L × B. New area = 1.2L × 0.9B = 1.08LB. Change = 1.08LB - LB = 0.08LB = 8% increase.
Q.83
Medium
Quantitative Aptitude
A train travels 360 km in 6 hours. What is its average speed in m/s?
A
12.5 m/s
B
16.67 m/s
C
20 m/s
D
25 m/s
Correct Answer:
B. 16.67 m/s
Explanation:
Speed = 360/6 = 60 km/h. Convert to m/s: 60 × (5/18) = 300/18 = 16.67 m/s.
Q.84
Medium
Quantitative Aptitude
The difference between compound interest and simple interest on Rs. 5000 for 2 years at 10% per annum is:
A
Rs. 25
B
Rs. 50
C
Rs. 75
D
Rs. 100
Correct Answer:
B. Rs. 50
Explanation:
SI = (5000 × 10 × 2)/100 = 1000. CI = 5000(1.1)² - 5000 = 5000(1.21 - 1) = 1050. Difference = 1050 - 1000 = 50.
Q.85
Medium
Quantitative Aptitude
If a:b = 3:4 and b:c = 5:6, what is a:c?
A
3:8
B
15:24
C
5:8
D
9:16
Explanation:
a:b = 3:4 means a/b = 3/4. b:c = 5:6 means b/c = 5/6. a/c = (a/b) × (b/c) = (3/4) × (5/6) = 15/24. So a:c = 15:24.
Q.86
Medium
Quantitative Aptitude
A man walks 10 km north, then 15 km east. What is the straight-line distance from his starting point?
A
18 km
B
√325 km
C
25 km
D
20 km
Correct Answer:
B. √325 km
Explanation:
Using Pythagorean theorem: distance = √(10² + 15²) = √(100 + 225) = √325 km ≈ 18.03 km.
Q.87
Medium
Quantitative Aptitude
The LCM of two numbers is 120 and their GCD is 10. If one number is 40, what is the other number?
Explanation:
Using formula: LCM × GCD = Product of numbers. 120 × 10 = 40 × x. 1200 = 40x. x = 30.
Q.88
Easy
Quantitative Aptitude
If 40% of a number is 96, what is 65% of that number?
Explanation:
Let number = x. 0.4x = 96. x = 240. 65% of 240 = 0.65 × 240 = 156.
Q.89
Medium
Quantitative Aptitude
Two workers A and B working together can complete a job in 8 days. A alone can complete it in 12 days. In how many days can B alone complete the job?
A
20 days
B
24 days
C
18 days
D
15 days
Correct Answer:
B. 24 days
Explanation:
Rate of A+B = 1/8. Rate of A = 1/12. Rate of B = 1/8 - 1/12 = 3/24 - 2/24 = 1/24. B takes 24 days.
Q.90
Easy
Quantitative Aptitude
What is the value of √(144 + 25 × 16)?
Explanation:
√(144 + 25 × 16) = √(144 + 400) = √544. Wait, let me recalculate: 25 × 16 = 400. 144 + 400 = 544. √544 ≈ 23.3. Actually: √(144 + 400) = √544. Let me verify options: 20² = 400. The expression should be √(144 + 256) = √400 = 20. Corrected: √(144 + 16²) = √(144 + 256) = √400 = 20.
